1. Section 9.1: Measures of Center and Spread

2. Objective(s):
By following instructions, students will be able to:
Describe and compare data sets.

3. Def: mean is the average
Def: median is the middle value in a set when the values are arranged in numerical order.

4. explain 1A Find the mean and median of each data set.
The number of text messages that Isaac received each day for a week is shown.
47, 49, 54, 50, 48, 47, 55

5. explain 1B Find the mean and median of each data set.
The amount of money Elise earned in tips per day for 6 days is listed below.
$75, $97, $360, $84, $119, $100

6. Your-Turn #1 Find the mean and median of each data set.
Niles scored 70, 74, 72, 71, 73, and 96 on his 6 geography tests.
b) Raul recorded the following golf scores in his last 7 games 84, 94, 93, 89, 94, 81, 90.

8. explain 2A
Find the median, range, and interquartile range for the given data set.
The April high temperatures for 5 years in Boston are 77 °F, 86 °F, 84 °F, 93 °F, and 90 °F.

9. explain 2B
Find the median, range, and interquartile range for the given data set.
The numbers of runs scored by a softball team in 20 games are given.
3, 4, 8, 12, 7, 5, 4, 12, 3, 9, 11, 4, 14, 8, 2, 10, 3, 10, 9, 7

10. Your-Turn #2
Find the mean, range, and interquartile range for the given data set.
21, 31, 26, 24, 28, 26
The high temperatures in degrees Fahrenheit on 11 days were
68, 71, 75, 74, 75, 71, 73, 71, 72, 74, and 79.

11. Def: standard deviation the average of the distance between individual data and the mean.

12. explain 3A
Find the standard deviation of 77, 86, 84, 93, 90.

13. explain 3B
Find the standard deviation of 3, 4, 8, 12, 7, 5, 4, 12, 3, 9, 11, 4, 14, 8, 2, 10, 3, 10, 9, 7.

14. Objective(s):
Did we…
Describe and compare data sets?

15. HW:
Sec 9.1 pg 314 #1-15